Pontiac 350 compression ratio? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 07-20-2010, 11:42 PM
Registered User
 
Join Date: Jun 2010
Location: Lancaster, CA
Posts: 229
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Pontiac 350 compression ratio?

I have a 1972 350 pontiac. the current compression ratio is 7.1:1 with a 117cc head. (what ive read) Im going to install pontiac 400 heads that are 87cc.
Anyone have a rough estimate on my compression pick up?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-21-2010, 01:01 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
I have no idea where your calculated CR comes from, but w/a 85cc chamber, a Pontiac 350 will have about a 7.85 CR. With a 117cc head, your CR would be around 6.3:1.

More: http://www.wallaceracing.com/cratio0001.htm
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-21-2010, 08:41 AM
h0trod389's Avatar
youll see me sideways
 
Last photo:
Join Date: Nov 2005
Location: N0r*cAL
Age: 38
Posts: 476
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
i use closed chamber heads on my 354's, the small bore needs all the help it can get
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-21-2010, 08:51 AM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 50
Posts: 4,021
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
I like this pontiac site.

http://www.projectpontiac.com/ppsite...tio-calculator
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Distributor Tuning and Theory - Part 1 Rick WI Engine 35 04-26-2011 12:38 AM
SHADE TREE: 3:50 Ratio SHADE TREE Transmission - Rearend 4 03-31-2006 01:27 AM
A compression ratio question Centerline Engine 7 11-20-2005 07:52 AM
cylinder psi vs compression ratio newchevyman Engine 2 07-06-2003 01:45 PM
compression ratio??? RedRocket Engine 1 10-25-2002 01:22 PM


All times are GMT -6. The time now is 02:59 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.